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Full text of "The Cambridge Natural History"



only two toes on tlie fore-feet. It is to be distinguished,
anatomically, from its larger relatives by the complete clavicle,
and by the fact that the pterygoids do not meet in the middle
line of the skull The ribs, too, are unusually wide, as in the
Whale Ifeobalaena, and form a bony encasement for the body.
It has two small caeca. Of fossil Anteaters but little is known.
The most interesting form is Scotaeops, interesting because it has
two small back teeth, which are totally lost in its living allies.
The huge Patagonian extinct bird Phororhacos, first known by a
lower jaw, was at one time regarded as a member of this group on
account of the form and edentulous character of the jaw.

Fam. 2. Bradypodidae.—The Sloths, genera Bradypus and

Fro. 96.—TTnau, or Two-toed Sloth.     Gholo&pus didactylus.    x£.
(After Vogt and SpecM.)
CIioloepi£$, come, as already stated, very near to the Anteaters, in
spite of their striking difference in appearance. The Sloths are
arboreal creatures, with strong recurved claws, which serve